Apple has become aware of a compatibility issue between QuickTime and Internet Explorer 5.5 SP2 and the Internet Explorer 6 Preview for Windows. To restore compatibility, those using these browsers need to install a small piece of software, called the ActiveX control, which is available on Apple's website (http://www.apple.com/quicktime/download/qtcheck).
This issue affects ONLY those using one of the above versions of Internet Explorer on a Windows-based computer. It does not affect those using Internet Explorer on a Macintosh or those using Netscape Navigator, other versions of Internet Explorer, or other web browsers.
In short, the above versions of Internet Explorer no longer support Netscape-style plug-ins, such as the plug-in installed with QuickTime 5.0.2 and earlier versions of QuickTime. As a result of this issue, when visiting a site with QuickTime content, Internet Explorer will display the icon of a broken plug-in.
To resolve the issue, customers using Internet Explorer on Windows should visit Apple's QuickTime site, where you will be prompted to download and install the ActiveX control (if you do not already have it). Note that if you have chosen to trust software from Apple during previous installations, you will not be prompted before the ActiveX control is installed.